Without going all technical the importance of good undesturbed REM Sleep is vital. I mentioned in another post that I have REM Sleep Behaviour Disorder and my body does not switch off and dreams are to various extents acted out. This can be linked to other neurological disorders/diseases so as DJ says in his reply, chase the medical staff up if you are not getting a sizable relief from CPAP use.

I was fortunate that the staff doing my sleep studies were also used to do EEG on many psychiatric and neuro patients also. It was they that spotted the abnormal readings in REM.

I have not resorted to sleeping tablets as I think I would no doubt become more exhausted during the day and they are addictive.

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Good Luck